Reproduction is the process of producing offspring of the same kind. Reproduction in animals can be either sexual or asexual reproduction. Sexual reproduction is the process wherein the male and female gametes fuse together to form a new individual. This process involves fertilization which can be internal or external. Internal fertilization takes place inside the body of the female whereas external fertilization takes place outside the body of the female. Asexual reproduction is the process in which a new individual is formed by the involvement of a single parent. The offspring produced are genetically and morphologically identical to the parent. Asexual reproduction occurs in unicellular organisms. The cells are divided by mitotic division and no fertilization takes place. It includes binary fission, budding, fragmentation, regeneration, parthenogenesis. This book elucidates the concepts and innovative models around prospective developments in relation to animal reproduction. Different approaches, evaluations, methodologies, and advanced studies on this topic have been included in it. This book is a vital tool for all researching or studying animal reproduction as it gives incredible insights into emerging trends and concepts.